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Voltage - Triode (single) ·Triode

B228

Early directly heated two-volt receiving triode for battery-operated electronic service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2 V / 100 mA

Description

B228 is listed in the supplied tube table as a triode. Published electrical values were transcribed from its target row.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
2 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
23000 Ω
Transconductance
0.0012 S
Amplification factor
28
Max plate voltage
150 V
Max plate dissipation
0.75 W

Published table ratings and electrical characteristics reviewed; ambiguous cells were not inferred.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    150 V

    Published table rating

  • Plate voltage

    150 V

    Published operating point

  • Control-grid bias

    2 V

    Published operating point

  • Plate current

    2 mA

    Published operating point

Characteristic

  • Plate resistance

    23000 ohm

    Published table characteristic

  • Amplification factor

    28

    Published table characteristic

  • Heater/filament voltage

    2 V

    Published heater/filament rating

  • Heater/filament current

    100 mA

    Published heater/filament rating

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Normal plate current

    2 mA

Characteristics

  • Grid-plate capacitance

    5.5 pF